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 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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package org.jetbrains.kotlin.completion

import com.intellij.lang.ASTNode
import com.intellij.psi.PsiComment
import com.intellij.psi.PsiElement
import com.intellij.psi.TokenType
import com.intellij.psi.impl.source.tree.TreeUtil

fun PsiElement.searchNonSpaceNonCommentBack(strict: Boolean): PsiElement? {
    if (node == null) return null
    
    var leftNeighbour = TreeUtil.prevLeaf(node)
    if (!strict) {
        while (leftNeighbour != null && (leftNeighbour.elementType == TokenType.WHITE_SPACE
                || leftNeighbour.psi is PsiComment)) {
            leftNeighbour = TreeUtil.prevLeaf(leftNeighbour)
        }
    }
    
    return if (leftNeighbour != null) leftNeighbour.psi else null
}

fun PsiElement.searchNonSpaceNonCommentBack() = searchNonSpaceNonCommentBack(false)